<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>

    var obj = {} // new Object()
    obj.__proto__ // Object.prototype

    function foo() { } // new Function(0)
    console.log(foo.length, foo.name, foo.__proto__)

    // Person.__proto__ == Function.prototype
    function Person() { }

    console.log(foo.__proto__ === Function.prototype)
    console.log(Person.__proto__ === Function.prototype)
    console.log(foo.__proto__ === Person.__proto__)
    console.log(Object.__proto__ === Function.prototype)
    console.log(Function.__proto__ === Function.prototype)

    var p1 = new Person()
    var p2 = new Person()

    console.log(Object.prototype)

  </script>
</body>

</html>